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Hugo, Colorado's, approximately 720 residents have been warned not to drink or cook using the local water supply after authorities found evidence of THC, the active ingredient in marijuana, in the system. KUSA's Noel Brennan reports. (Published Friday, July 22, 2016)

Officials told residents of a small Colorado town not to shower or drink tap water Thursday because wells have been contaminated with marijuana's intoxicating chemical.

Hugo, about 100 miles southeast of Denver on Colorado's plains, prohibits marijuana cultivation, product manufacturing, testing facilities and retail marijuana stores that are legal in the state, so it's not known how THC appeared in the water supply.

Micki Trost, spokeswoman for the Colorado Division of Emergency Management, did not know whether anyone had reported being sickened in the community of about 730 people. She also didn't know the source or extent of the contamination but said state investigators were headed to Hugo.

No one has displayed symptoms, the Lincoln County sheriff's office said, adding that federal authorities also were involved in the investigation.